Which voltages does the DC power supply transformer produce and what do they power?

• A. +12 VDC to Detector Heads and +5 VDC to all electronic on the 1A1 circuit
• B. +12 VDC to all electronics and +5 VDC to the detector heads
• C. +24 VDC to the detector heads and +12 VDC to electronics
• D. +12 VDC to electronics and +5 VDC to the detector heads

Answer: (A)

Two separate DC rails are provided to power different parts of the system: a higher 12 V supply for the detector heads and a lower 5 V supply for all electronics on the 1A1 circuit. Detector heads typically require more voltage and current to drive their sensors or actuators, while the electronics logic and control circuitry run on 5 V, which is the standard voltage for many digital ICs and microcontrollers. Keeping these rails separate helps keep the sensitive electronics stable and protected from the noise and voltage swings that the detector loads can create, and it ensures each component operates within its rated voltage. The other allocations would either underpower the detector heads, overvolt the electronics, or otherwise mismatch component ratings, making operation unreliable or damaging components.